The new BMW G90 M5 is already a masterpiece of modern engineering—a luxury sedan fused with supercar-level performance. With the S68 twin-turbo V8 engine under the hood and advanced xDrive all-wheel-drive system, it’s built for both power and poise. But for performance enthusiasts looking to unlock the full potential of this machine, one upgrade stands out above the rest: a MW M5 G90 downpipe.
Whether you’re chasing raw horsepower, faster turbo spool, or a more aggressive exhaust tone, high-performance M5 G90 downpipes are the foundation of any serious build.
Why Upgrade Your G90 Downpipe?
From the factory, the G90 downpipe is designed with emissions compliance in mind—not outright performance. Stock downpipes restrict exhaust flow and stifle the V8’s true potential. Replacing them with aftermarket downpipes for BMW G90 M5 significantly improves exhaust efficiency and engine response.
Here’s what you can expect:
Major Performance Gains
An aftermarket MW M5 G90 downpipe reduces backpressure and allows the turbos to spool faster. This means more horsepower and torque across the powerband. When paired with a Stage 2 tune, gains of 60–100+ hp are realistic.
Enhanced Exhaust Sound
OEM downpipes muffle the natural growl of the twin-turbo V8. Performance M5 G90 downpipes unleash that deep, raw tone every enthusiast craves—without being obnoxious. Expect a louder, sportier note with addictive turbo whistle and crackles on downshifts.
Faster Turbo Spool & Throttle Response
With less restriction between the turbos and the exhaust system, upgraded G90 downpipes help you achieve faster boost, sharper acceleration, and more responsive throttle inputs.
Essential for Stage 2+ Builds
If you’re planning aggressive tuning or larger turbos, aftermarket downpipes for BMW G90 M5 are a must. Stock units can’t support higher boost levels and will quickly become a bottleneck for your performance goals.
Catted vs. Catless M5 G90 Downpipes: What’s Best?
When selecting a MW M5 G90 downpipe, you’ll typically choose between high-flow catted and catless versions:
Catted Downpipes
These include high-flow catalytic converters that reduce emissions and smells while still improving performance. They are a good compromise for those who want more power without going fully catless. Many states also prefer them for emissions testing.
Catless Downpipes
These remove catalytic converters entirely, offering the most airflow and the most aggressive sound. However, they are intended for off-road or racing use only, and may cause a CEL (check engine light) unless properly tuned.
Both versions can be found at AXI Performance, which offers premium downpipes BMW G90 M5 owners trust for quality and fitment.
Key Features to Look for in G90 Downpipes
Not all downpipes are made equal. Here’s what you should prioritize when shopping for your MW M5 G90 downpipe:
- Material: T304 or T316 stainless steel ensures durability and heat resistance.
- Weld Quality: Precision TIG welding improves strength and reduces failure points.
- Fitment: Look for a direct bolt-on solution designed specifically for the G90 chassis.
- O2 Sensor Compatibility: Ensure your chosen setup includes proper bungs for oxygen sensors.
- Tuning Ready: The best M5 G90 downpipes are compatible with major tuning platforms like Bootmod3 or MHD.
Installation & Tuning Tips
Installing G90 downpipes usually takes 3–4 hours and should be performed by a professional unless you’re experienced with undercar work. A tune is highly recommended after installation to fully unlock performance gains and eliminate check engine lights (especially with catless setups).
Pair your new MW M5 G90 downpipe with a Stage 2 tune, upgraded intake, and intercoolers for a complete performance transformation.
Where to Buy the Best Downpipes for BMW G90 M5?
When it comes to premium aftermarket parts, AXI Performance stands out as a trusted supplier. Their G90 M5 downpipes are crafted with performance in mind, offering unmatched build quality and precise fitment for the new-generation M5.
Whether you choose a catted or catless system, you’re investing in real performance and a sound that matches the G90’s aggressive styling and raw potential.
Final Thoughts
If you’re ready to wake up the S68 engine and experience the full power of the G90 M5, a high-performance MW M5 G90 downpipe is the perfect place to start. From improved spool times and brutal power gains to that intoxicating exhaust tone, the benefits are immediate and undeniable.
Upgrade your M5 G90 downpipes today and transform your luxury sedan into a track-ready monster that sounds as mean as it drives.
